CVE-2023-32320 Nextcloud Server's brute force protection allows someone to send more requests than intended

2023-06-2220:57:54

CWE-307

GitHub_M

www.cve.org

nextcloud

server

brute force

protection

vulnerability

requests

parallel

limit

security issue

8.7 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

8.7 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

47.9%

JSON

Nextcloud Server is a data storage system for Nextcloud, a self-hosted productivity platform. When multiple requests are sent in parallel, all of them were executed even if the amount of faulty requests succeeded the limit by the time the response was sent to the client. This allowed someone to send as many requests the server could handle in parallel to bruteforce protected details instead of the configured limit, default 8. Nextcloud Server versions 25.0.7 and 26.0.2 and Nextcloud Enterprise Server versions 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7 and 26.0.2 contain patches for this issue.

CNA Affected

[
  {
    "vendor": "nextcloud",
    "product": "security-advisories",
    "versions": [
      {
        "version": "Nextcloud Server >= 25.0.0, < 25.0.7",
        "status": "affected"
      },
      {
        "version": "Nextcloud Server >= 26.0.0, < 26.0.2",
        "status": "affected"
      },
      {
        "version": "Nextcloud Enterprise Server  >= 21.0.0, < 21.0.9.12",
        "status": "affected"
      },
      {
        "version": "Nextcloud Enterprise Server  >= 22.0.0, < 22.2.10.12",
        "status": "affected"
      },
      {
        "version": "Nextcloud Enterprise Server  >= 23.0.0, < 23.0.12.7",
        "status": "affected"
      },
      {
        "version": "Nextcloud Enterprise Server  >= 24.0.0, < 24.0.12.2",
        "status": "affected"
      },
      {
        "version": "Nextcloud Enterprise Server  >= 25.0.0, < 25.0.7",
        "status": "affected"
      },
      {
        "version": "Nextcloud Enterprise Server  >= 26.0.0, < 26.0.2",
        "status": "affected"
      }
    ]
  }
]